Frederik mohr



(No Model.)

F. MOHR, MANUFACTURE OF CARTRIDGE GASES.

Patented May 9, 1893.

UNITED STATES PATENT OFFICE.

FREDERIK MOHR, OF MAGDEBURG-BUGKAU, GERMANY, ASSIGNOR TO THEGRUSONVVERK, OF SAME PLACE.

MANUFACTURE OF CARTRIDGE-CASES.

SPECIFICATION forming part of Letters Patent No. 497,192, dated May 9,1893.

Application filed October 5, 1892. Serial No. 447,895. (No model.)

To all whom it may concern: ample strength in the corner of the caseafter Be it known that I, FREDERIK MOHR,asubthe end is flattened. Thereit is necessary ject of the Kingof Denmark, and aresidentof that thecase shall have a contraction e as lVIagdeburg-Buckau, in the Kingdom ofPrusshown in Fig. 3 such contraction may be sub- 5 sia, German Empire,have invented certain sequently produced by suitably rolling the new anduseful Improvements in the Manucase under a die. facture ofCartridge-Cases, of which the fol- If the case, after it has beenfinished, is to lowing is a specification. have a full, annular swellingin its interior as My invention relates to the manufacture of shown inFig. 6 instead of the groove 6, Fig.

IO cartridge cases, and has for its object to sim- 3 the reinforcement fin the bottom corner of plify such manufacture chiefly with referencethe cylinder must, in the original form Fig. 4, to the method of formingthe rim. extend some distance up to the cylinder to In the manufactureof cartridge-cases as allow of the formation of aninternal annularheretofore practiced special difficulties were groove 9 Fig. 5 in thesaid thickened portion.

I 5 met with in pressing out the rim; these diffi- The annular rib hthus produced, remains culties are entirely overcome by the presentstanding when the end of the cylinder is invention. pressed flat asshown in Fig. 6.

According to this invention, the cartridge- As compared with the methodsheretofore case is worked as heretofore described, while used, in whichthe metal in the cylinder ends 20 the bottom or end of the case isvaulted or is forced by enormous pressure to flow into curved and thecase is then pressed to its finthe required shape for the rim, thehereindeished shape. scribed method has the advantage that the In theaccompanying drawingsz-Figure 1 rimoan be produced in a simple manner ata represents in central section a form to which low pressure.

25 the lower end of the case is first brought in Having now particularlydescribed my inany suitable or well-known manner, as for vention, what Iclaim isexample by pressing, drawing or casting. 1. The herein describedmethod of forming Fig. 2 shows an intermediate stage of the prothe rimof a cartridge-case which consists in cess of manufacture, and Fig.3shows the end first producing a cylinder with a vaulted or 30 of thefinished case. Figs. 4,5 and 6 are simicurved end thickened in thecorner, then prolar views illustrating a slight modification. vidingsaid cylinder with an external annu- Referring to Fig. 1 it will be seenthat the lar groove, and finally pressing the bottom bottom a is madewith a considerable curvafiat, substantially as, and for the purposeture, and the angle or corner I) between the specified.

35 cylindrical part and the end is thickened for 2. The herein describedmethod of forming apurpose hereinafter explained. In the outercartridge-cases, with external rims and interside of the case at c isnow formed either nal swells, which consists in forming cylinby turning,or by rolling by means of an inders with the vaulted or curved ends andclined disk of a suitable shape, an undercut thickened edges and sidesadjacent to the 0 annular groove somewhat of the section edges, thenforming the external and internal shown, so that the case is brought tothe shape annular grooves d and g, and then compressrepresented in Fig.2. cl is a thin rim of metal ing the vaulted ends, substantially in theman- 1 left at the end of the case after the groove 0 ner and for thepurpose set forth. is formed. Next, the bottom or end a is 45 pressedfiat by means of suitable stamps and FREDERIK MOHR.

dies, whereby the rim cl is caused to assume Witnesses: the form shownin Fig. 3. The thick or full HERMANN LUBOWSKI, portion Z) previouslyreferred to is to provide EMIL KALLNEOKER.

